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Does anyone know whether it's a problem with Extension Manager, with this specific extension, or with the horrendous Windows 10? But obviously lots and lots of people must be simply giving up the task because of this "does not exist" issue. I had no choice but to find a way to do this, because my AOO had suddenly "lost" the spellcheck dictionary so that every single word was failing the spellcheck. Refer to the comment on page 2 below from "Anonymous" on for step-by step instructions, but now also add the bit about changing the filename.
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I had the same problem with the "C:\long file path\blah blah\ does not exist" error message, basically had to create the last couple of folders in the path, paste the downloaded file into place and also change the name of the file to just "dict-en" to get the Extension Manager to work.
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